Segmentation fault: Stack allocation in a C program in Ubuntu when bufffer>4M

Question

Here\'s a small program to a college\'s task:

#include 

#ifndef BUFFERSIZE
#define BUFFERSIZE 1
#endif

main()
{
    char buffer[BUFFERSIZE]         


        

Answer 1

The stack size is quite often limited in Linux. The command ulimit -s will give the current value, in Kbytes. You can change the default in (usually) the file /etc/security/limits.conf. You can also, depending on privileges, change it on a per-process basis via the code:

#include 
// ...
struct rlimit x;
if (getrlimit(RLIMIT_STACK, &x) < 0)
    perror("getrlimit");
x.rlim_cur = RLIM_INFINITY;
if (setrlimit(RLIMIT_STACK, &x) < 0)
    perror("setrlimit");